My first thought, at least for the top space, would be a place to store your turning tools. Either in the open on hangers, or in a cabinet that you could open up and have them on the wall in the cabinet, and on the door. U shaped hangers with a lip on the outside edge so they couldn't accidentally fall off. Shelves below for some turning blanks is a good idea.
Or, you could hang your longer clamps there...I would think long ones would be the ones less often used. Jim.
Home of Irish Setter Rescue of North Texas
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